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Panax Notoginseng Saponins Improve the Erectile Dysfunction in Diabetic Rats by Protecting the Endothelial Function of the Penile Corpus Cavernosum

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Panax Notoginseng Saponins Improve the Erectile Dysfunction in Diabetic Rats by Protecting the Endothelial Function of the Penile Corpus Cavernosum International Journal of Impotence Research (2013) 25, 206–211 & 2013 Macmillan Publishers Limited All rights reserved 0955-9930/13 www.nature.com/ijir ORIGINAL ARTICLE Panax notoginseng saponins improve the erectile dysfunction in diabetic rats by protecting the endothelial function of the penile corpus cavernosum F Lin and X Gou Diabetes mellitus (DM)-associated ED is predominantly due to neurovascular dysfunction mediated by nitric oxide (NO) suppression. Panax notoginseng saponins (PNS) are widely used for treating cardiovascular disease in China. The aim of this study was to evaluate the effects of PNS on penile erection and corpus cavernosum tissues in rats with diabetes-associated ED. Four weeks after PNS treatment, erectile function was assessed by intracavernous pressure (ICP) and mean arterial pressure (MAP) measurements. The level of NO, cyclic guanosine monophosphate (cGMP) and advanced glycation end products (AGEs) in cavernous tissue were assessed. Immunohistochemical staining and TUNEL (terminal deoxynucleotidyl transferase dUTP nick end labeling) were performed for detecting endothelial NO synthase (eNOS) and apoptosis, respectively. The results show that ICP/MAP ratio was significantly increased in high-dose (150 mg kg À 1 per day) PNS-treated group compared with the diabetic ED untreated group (DM group). Compared with the untreated group, the expression of eNOS and the levels of NO and cGMP were increased in the PNS-treated groups. Moreover, apoptosis was markedly decreased in the group that received 150 mg kg À 1 per day of PNS. These results suggest that PNS may be used for improving the ED in diabetic rats via the NO/cGMP pathway and restores the function of endothelium in corpus cavernosum. International Journal of Impotence Research (2013) 25, 206–211; doi:10.1038/ijir.2013.19; published online 18 April 2013 Keywords: corpus cavernosum endothelium; diabetes mellitus; endothelial nitric oxide synthase; ED; NO INTRODUCTION results in treating ED in nondiabetic ones, its efficacy is 7,8 ED is recognized as a serious and common chronic complication significantly lower in diabetic ED patients. of diabetes mellitus (DM).1 ED in diabetes patients usually starts Panax notoginseng is one of the most widely used traditional 10–15 years earlier than in the general population. Recent studies Chinese herbal medicines for the treatment of coronary heart on the molecular pathophysiologic mechanisms of diabetes- disease, atherosclerosis, cardiac angina and apoplexy in China. induced ED have suggested that this disease is predominantly due Panax notoginseng saponins (PNS) are the main active ingredient to neurovascular dysfunction. Normal erectile function primarily of Panax notosinseng, which is reported to be responsible for the depends on vasodilatation, which is mainly regulated by both therapeutic action of this medicine. Ginsenosides Rg1, Rb1 and Rd, nerve and endothelium-derived nitric oxide (NO).2 Under a normal and notoginsenoside R1 are considered to be the major 9 situation, the endothelial NO synthase (eNOS) produces a components of PNS. Numerous studies have demonstrated that physiological level of NO in endothelial cells. From a recent PNS has extensive effects on the cardiovascular system, including review, it is clear that NO production is markedly decreased, which increasing blood flow through the coronary arteries, promoting 10,11 is correlated with reduced eNOS expression in the penis of angiogenesis, inhibiting vessel restenosis after vascular intimal 12 diabetic rats, following chemical diabetogenesis.3 Previous studies injury, protecting on lipopolysaccharide-induced microcircu- 13 have shown that high blood glucose levels can increase latory disturbance, and maintaining the normal expansion and 14,15 accumulation of advanced glycation end products (AGEs) that contraction of vascular smooth muscle. In addition, PNS are responsible for low neuronal and endothelial-derived NO- improves the sensitivity of insulin and leptin, which contributes to 16 mediated relaxation of corpus cavernosum.4 When dysfunction its anti-hyperglycemic and anti-obese activities. Meanwhile, PNS occurs in penis endothelial cells, erectile function may be could enhance the mRNA expression of the most important 11 disrupted. Thus, diabetes has the potential to have an impact vascular endothelial growth factor. Recent studies have shown on all the components of the erectile response. that intracavernous injection of vascular endothelial growth factor Multiple approaches have been used to treat diabetes ED. These improves ED through restoration of the insulin-like growth factor includes diabetes control, psychosexual counseling, PDE5 inhibi- system and sex hormone receptor genes at the mRNA and tors and antihypertensive medications.5 The PDE5 inhibitors, such protein levels, and inhibition of apoptosis in corpora cavernosa in 17,18 as sildenafil, vardenafil and tadalafil, are efficacious oral medicine diabetic rats. Those effects suggest that the restoration of the for ED therapy. The efficacy of the PDE5 inhibitors is mainly due to endothelial function could be a valuable approach for treating ED counteraction of the degradation of cGMP, which is generated via in DM. In this study, we investigated the hypothesis that by NO/cGMP pathway.6 Although PDE5 inhibitor has shown good improving the erectile function in DM via the NO/cGMP pathway, Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China. Correspondence: Professor X Gou, Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China. E-mail: [email protected] Received 27 April 2012; revised 7 February 2013; accepted 13 March 2013; published online 18 April 2013 Panax notoginseng saponins in treating diabetic ED F Lin and X Gou 207 PNS restores the function of endothelium in corpus cavernosum. Institute, Nanjing, China).20,21 Absorbance was measured at 550 nm in a The results suggest that PNS improves the ED in diabetic rats via microplate reader (Thermo Fisher Scientific, Waltham, MA, USA) and the the NO/cGMP pathway and restores the function of endothelium NO level was detected according to the standard graph of sodium nitrite À 1 in corpus cavernosum. (in the range 1–10 mmole ml ). cGMP and AGEs analysis MATERIALS AND METHODS The level of tissue-active AGEs was measured by ELISA using the Rat AGEs Experimental animals ELISA Kit, following the manufacturer’s instructions (BIOTANG, Walthem, Sprague–Dawley rats (male, 180–220 g of body weight) were purchased MA, USA). cGMP was performed by ELISA using the cGMP Parameter Assay from the Laboratory Animal Center of Chongqing Medical University, and Kit in accordance with the protocol specified by the manufacturer (R&D were housed in a specific pathogen-free environment and given ad libitum Systems, Minneapolis, MN, USA). access to food and water. All procedures were carried out in accordance with guidelines of the Chinese animal use, and were approved by the Immunohistochemistry ethics committee of Chongqing Medical University. The tissue samples were fixed, paraffin-embedded and then sectioned at After fasting for 16 h with free access of water, diabetes was induced by 5-m thickness. After dewaxing and rehydrating, the tissue sections were intraperitoneal injection of streptozotocin (STZ; Sigma Chemical, St Louis, washed with phosphate-buffered saline and treated with 3% hydrogen MO, USA, 60 mg kg À 1) in sterile citrate buffer. The normal rats of the peroxide (H2O2) for 15 min at 37 1C to inhibit endogenous peroxidase control group (n ¼ 6) were injected with an equivalent volume of citrate activity. Antigen retrieval was performed by placing the sections in citrate buffer. The rats were examined for blood glucose via tail vein using an buffer and heated for 30 min in a microwave oven. The sections were Ultra Vue glucose monitor (Johnson & Johnson, Shanghai, China) at 1 and 2 blocked in 4% goat serum for 30 min at 37 1C, followed by incubation at weeks after STZ injection. The rats were considered diabetic if their À 1 4 1C overnight with primary anti-eNOS antibody (BD Biosciences, San Jose, blood glucose levels were above 16.7 mmol l at the two examining time CA, USA; 1:100 dilution). The sections were then incubated with biotin- points. At 12 weeks of diabetes, the rats were placed in a transparent conjugated secondary antibody (Zhongshan Golden Bridge Biotechnology, observation cage, and were put in a tranquil laboratory without light for Beijing, China) for 30 min at 37 1C and subsequently avidin–biotin 10 min to allow them to adapt to the new environment. The rats were À 1 horseradish peroxidase complex for 30 min at 37 1C, and followed by injected with apomorphine (APO; Sigma Chemical, 100 mlkg ) subcuta- treatment with DAB chromogen for reaction visualization. The sections neously to the back of the neck. The frequency of penile erection of each were counterstained with diluted hematoxylin and mounted with neutral tested animal was observed and recorded by researchers for 30 min. An gum. In the negative control, the primary antibody was replaced by erection was counted only if the emergence of an engorged glans penis phosphate-buffered solution. For image analysis, five randomly selected and distal shaft was noted. The rats showing no erection were considered fields per section were photographed and recorded. Quantitative image to have ED and used for further experiments. analysis of the  400 magnification images was performed by computer-
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